Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7d8a8c549df465…

MALICIOUS

PDF

96.4 KB Created: 2021-01-14 05:46:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c5f41c97217f6e5a358514794f02fc33 SHA-1: 5b9ddc1ebbf9838d9d3d7606e6c78fe19f056dcb SHA-256: ab7d8a8c549df46583f7e1e0c56f794d16fe6a2625c6cbe89e38da8f77256e13
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains numerous embedded URLs, many hosted on disposable domains, suggesting a phishing or scam campaign. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffine.ru/aws?utm_term=angular+bootstrap+form+example In PDF document text
    • https://cdn.sqhk.co/monasomeb/5jgsNhh/tovitatarubajaleguzibex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408586/normal_5fa0241f4512a.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/kovolobox.pdfIn PDF document text
    • https://site-1168003.mozfiles.com/files/1168003/5177298090.pdfIn PDF document text
    • https://jetujipizi.weebly.com/uploads/1/3/0/8/130813705/zoliweporaxasik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487902/normal_5fe3e83705942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426410/normal_5fa2ac653247e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426572/normal_5fbd46765e825.pdfIn PDF document text
    • https://site-1174284.mozfiles.com/files/1174284/project_on_pile_foundation.pdfIn PDF document text
    • https://cdn.sqhk.co/jenexovu/LWgcKjb/cut_3d_model_revit_to_rhino.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/90527171442.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFA 5420 bytes
SHA-256: 9ea0a9f47127a1c0e01e2d481ca10e6e7bfb3e06262ec6c066b7a911b7980ac8
font_01_sfnt_off00013e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E59 16780 bytes
SHA-256: ca9d51545966a704f2c1ecf1bdc7a266184090199f9b229903d72515b6a275a8

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